I was in the Local Wally the other day to pick up 6qts of Motorcraft 5w20, and an FL820s( We don't sell MC filters @ Meijer, just Fram, Puro, and M1) for my Uncle's Lincoln Zephyr(Duratec 3.0) went in, got the stuff, was nearly to the register, when i double checked the oil, I had accidentally grabbed the 5w30.
so yes it does exist in the wild.
btw, for the 5 qt jug, extra qt, fl820s, a bottle of Soda, and a pack of gum, it was $30.11